overflow sites are planned. >> president obama and the first lady will be among the dozens of dignitaries honoring mandela tomorrow in south africa. a soccer stadium will serve as the backdrop for a national memorial service >> former presidents george w bush, bill clinton and jimmy carter also expected to attend. they will join tens of thousands of mourners at the johanessburg stadium. >> u.s. defense secretary chuck hagel has arrived in pakistan for meetings with prime minister nawaz sharif and other officials. pentagon spokesman carl woog says hagel is looking forward to "candid and about ways to address common stability of neighboring afghanistan. u.s. relations with pakistan have seesawed because of drone strikes and military operations along the pakistan-afghanistan border, though there have been some signs of improvement. sharif met with president barack the last pentagon chief to gates in january 2010. hagel flew to pakistan from afghanistan, where he visited u.s. troops but president hamid karzai, who has rankled the u.s. by refusing to sign a security agreement before year's end